Gaia Data Release 2 Observations of solar system objects

被引：52

作者：

Spoto, F. ^{[1
,2
]}

Tanga, P. ^{[1
]}

Mignard, F. ^{[1
]}

Berthier, J. ^{[2
]}

Carry, B. ^{[1
,2
]}

Cellino, A. ^{[3
]}

Dell'Oro, A. ^{[4
]}

Hestroffer, D. ^{[2
]}

Muinonen, K. ^{[5
,6
]}

Pauwels, T. ^{[7
]}

Petit, J. -M. ^{[8
]}

David, P. ^{[2
]}

De Angeli, F. ^{[9
]}

Delbo, M. ^{[1
]}

Frezouls, B. ^{[10
]}

Galluccio, L. ^{[1
]}

Granvik, M. ^{[5
,11
]}

Guiraud, J. ^{[10
]}

Hernandez, J. ^{[12
]}

Ordenovic, C. ^{[1
]}

Portell, J. ^{[13
]}

Poujoulet, E. ^{[14
]}

Thuillot, W. ^{[2
]}

Walmsley, G. ^{[10
]}

Brown, A. G. A. ^{[15
]}

Vallenari, A. ^{[16
]}

Prusti, T. ^{[17
]}

de Bruijne, J. H. J. ^{[17
]}

Babusiaux, C. ^{[18
,19
]}

Bailer-Jones, C. A. L. ^{[20
]}

Biermann, M. ^{[21
]}

Evans, D. W. ^{[9
]}

Eyer, L. ^{[22
]}

Jansen, F. ^{[23
]}

Jordi, C. ^{[13
]}

Klioner, S. A. ^{[24
]}

Lammers, U. ^{[12
]}

Lindegren, L. ^{[25
]}

Luri, X. ^{[13
]}

Panem, C. ^{[10
]}

Pourbaix, D. ^{[26
,27
]}

Randich, S. ^{[4
]}

Sartoretti, P. ^{[18
]}

Siddiqui, H. I. ^{[28
]}

Soubiran, C. ^{[29
]}

van Leeuwen, F. ^{[9
]}

Walton, N. A. ^{[9
]}

Arenou, F. ^{[18
]}

Bastian, U. ^{[21
]}

Cropper, M. ^{[30
]}

机构：

[1] Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France

[2] Univ Lille, Sorbonne Univ, IMCCE, Observ Paris,Univ PSL, 77 Av Denfert Rochereau, F-75014 Paris, France

[3] INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, TO, Italy

[4] INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy

[5] Univ Helsinki, Dept Phys, POB 64, Helsinki 00014, Finland

[6] Finnish Geospatial Res Inst FGI, Geodeetinrinne 2, Masala 02430, Finland

[7] Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium

[8] Univ Bourgogne Franche Comte, Inst UTINAM UMR6213, CNRS, OSU THETA Franche Comte Bourgogne, F-25000 Besancon, France

[9] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[10] CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-31401 Toulouse 9, France

[11] Lulea Univ Technol, Dept Comp Sci Elect & Space Engn, Box 848, S-98128 Kiruna, Sweden

[12] European Space Astron Ctr ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[13] Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti & Franques 1, E-08028 Barcelona, Spain

[14] AKKA CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, Toulouse 9, France

[15] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands

[16] INAF Osservatorio astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

[17] European Space Res & Technol Ctr ESA ESTEC, Sci Support Off, Directorate Sci, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands

[18] Univ PSL, CNRS, GEPI, Observ Paris, 5 Pl Jules Janssen, F-92190 Meudon, France

[19] Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France

[20] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[21] Heidelberg Univ, Astron Rechen Inst, Zentrum Astron, Monchhofstr 12-14, D-69120 Heidelberg, Germany

[22] Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland

[23] European Space Res & Technol Ctr ESA ESTEC, Mission Operat Div, Operat Dept, Directorate Sci, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands

[24] Tech Univ Dresden, Lohrmann Observ, Mommsenstr 13, D-01062 Dresden, Germany

[25] Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, S-22100 Lund, Sweden

[26] Univ Libre Bruxelles, Inst Astron & dAstrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium

[27] FRS FNRS, Rue Egmont 5, B-1000 Brussels, Belgium

[28] Telespazio Vega UK Ltd ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[29] Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N Allee Geoffroy Saint Hilaire, F-33615 Pessac, France

[30] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

[31] INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy

[32] Serco Gest Negocios ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[33] ALTEC Spa, Corso Marche 79, I-10146 Turin, Italy

[34] Univ Geneva, Dept Astron, Chemin Ecogia 16, CH-1290 Versoix, Switzerland

[35] ESAC, Gaia DPAC Project Off, Camino Bajo Castillo S-N, Madrid 28692, Spain

[36] Sorbonne Univ, SYRTE, Observ Paris, Univ PSL,CNRS,LNE, 61 Ave Observ, F-75014 Paris, France

[37] Natl Observ Athens, Athens 15236, Greece

[38] Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[39] Katholieke Univ Leuven, Inst Sterrenkunde, Celestijnenlaan 200D, B-3001 Leuven, Belgium

[40] Univ Liege, Inst Astrophys & Geophys, 19c Allee 6 Aout, B-4000 Liege, Belgium

[41] ATG Europe ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[42] Univ Pablo Olavide, Area Lenguajes & Sistemas Informat, Ctra Utrera Km 1, Seville 41013, Spain

[43] Univ Vigo, ETSE Telecomun, Campus Lagoas Marcosende, Vigo 36310, Galicia, Spain

[44] Large Synopt Survey Telescope, 950 N Cherry Ave, Tucson, AZ 85719 USA

[45] Univ Strasbourg, Observ Astron Strasbourg, CNRS, UMR 7550, 11 Rue Univ, F-67000 Strasbourg, France

[46] Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambride, England

[47] Aurora Technol ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[48] Univ Montpellier, Lab Univers & Particules Montpellier, Pl Eugene Bataillon,CC72, F-34095 Montpellier 05, France

[49] Uppsala Univ, Div Astron & Space Phys, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden

[50] Univ Lisbon, CENTRA, FCUL, Edif C8, P-1749016 Lisbon, Portugal

来源：

ASTRONOMY & ASTROPHYSICS | 2018年 / 616卷

基金：

瑞士国家科学基金会; 爱尔兰科学基金会; 美国国家航空航天局; 美国国家科学基金会; 欧洲研究理事会; 巴西圣保罗研究基金会; 英国科学技术设施理事会; 以色列科学基金会; 芬兰科学院; 奥地利科学基金会;

关键词：

astrometry; minor planets; asteroids:; general; methods: data analysis; space vehicles: instruments; ASTEROIDS; PHOTOMETRY; INVERSION;

D O I：

10.1051/0004-6361/201832900

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. The Gaia spacecraft of the European Space Agency (ESA) has been securing observations of solar system objects (SSOs) since the beginning of its operations. Data Release 2 (DR2) contains the observations of a selected sample of 14,099 SSOs. These asteroids have been already identified and have been numbered by the Minor Planet Center repository. Positions are provided for each Gaia observation at CCD level. As additional information, complementary to astrometry, the apparent brightness of SSOs in the unfiltered G band is also provided for selected observations. Aims. We explain the processing of SSO data, and describe the criteria we used to select the sample published in Gaia DR2. We then explore the data set to assess its quality. Methods. To exploit the main data product for the solar system in Gaia DR2, which is the epoch astrometry of asteroids, it is necessary to take into account the unusual properties of the uncertainty, as the position information is nearly one-dimensional. When this aspect is handled appropriately, an orbit fit can be obtained with post-fit residuals that are overall consistent with the a-priori error model that was used to define individual values of the astrometric uncertainty. The role of both random and systematic errors is described. The distribution of residuals allowed us to identify possible contaminants in the data set (such as stars). Photometry in the G band was compared to computed values from reference asteroid shapes and to the flux registered at the corresponding epochs by the red and blue photometers (RP and BP). Results. The overall astrometric performance is close to the expectations, with an optimal range of brightness G similar to 12 - 17. In this range, the typical transit-level accuracy is well below 1 mas. For fainter asteroids, the growing photon noise deteriorates the performance. Asteroids brighter than G similar to 12 are affected by a lower performance of the processing of their signals. The dramatic improvement brought by Gaia DR2 astrometry of SSOs is demonstrated by comparisons to the archive data and by preliminary tests on the detection of subtle non-gravitational effects.

引用

页数：24

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